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iPhone 6s backlight issue after water damage

iPhone and Apple Products Hardware Repair - GSM-Forum - forum.gsmhosting.com
Have a 6s that had short on bl_anode capacitor. Replaced it.

No backlight so replaced u4020 still nothing.

Diodes are good, filters are good. Both coils have resistance that correspond to the schematic so presuming those are good.

There's no voltage boosting

Can someone test voltage at R4020 in a working 6s? It's a clock signal and I get 0v not sure if that should be 1.8v or not


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